A police officer pulled over 33-year-old Jeremiah E. Johnson's car after the man ran a red light at the intersection of Nelson Brogdon Boulevard and Buford Highway in Buford on Jan. 11.

While running the car's information, the officer learned Johnson was reported missing in Iowa and that he had taken his son, Johnnathon Johnson, during a custody dispute with the child's mother, according to Gwinnett County Police. The officer spotted Johnnathon in the back seat of the car.

When the officer asked Johnson to step out of the car, the suspect drove away, with the child still inside. The officer followed, but lost Johnson's car as it crossed into Forsyth County, police said.

Some of Johnson's personal belongings were discovered abandoned in Jackson County over the weekend. Gwinnett Police say Johnson is homicidal and suicidal, and they are concerned for his son's well-being.

So far, Gwinnett County Police have not been able to issue an AMBER Alert or Levi's Call for Johnnathon Johnson because his disappearance does not meet criteria set by the state, according to investigators.

Jeremiah Johnson is described as a white man, 5 feet 9 inches tall and 230 pounds, with blonde hair and green eyes. He is driving a silver 2003 Volkswagen Passat with Iowa tag 608ZDB. The car has a carrier hitch on the back and a large television attached to the back of the front seat. There are also writings around the outside of the car, including one that says "9/11 Veteran."

Anyone who sees Johnson or his car is asked to call 911 or Gwinnett County Police at 770-515-5000.